Revision as of 19:11, 29 June 2024 edit Citation bot (talk \| contribs) Bots 5,863,087 edits Altered date. Add: date, authors 1-1. Removed parameters. Some additions/deletions were parameter name changes. \| Use this bot. Report bugs. \| Suggested by Abductive \| #UCB_webform 3731/3850 ← Previous edit		Revision as of 09:30, 1 July 2024 edit undo Adamalpaca (talk \| contribs) 1 edit m If the second implementation is 1700 faster than the first at 2.8 microseconds, then the first implementation should be 4.76 ms not nanoseconds. There is no source on the result of the benchmark so there is no way for me to verify the values here, my correction is merely inferred from the text Tag: Visual edit Next edit →
Line 228: </syntaxhighlight> has the mean execution time of 4.76 ~~nanoseconds~~ms, while the second one, in which <syntaxhighlight lang="clojure" inline>.equals</syntaxhighlight> is a direct invocation of the underlying [[Java (programming language)\|Java]] method, has a mean execution time of 2.8 μs – roughly 1700 times faster. Part of that can be attributed to the type checking and exception handling involved in the implementation of <syntaxhighlight lang="clojure" inline>even?</syntaxhighlight>, so let's take for instance the [https://github.com/samber/lo lo library] for [[Go (programming language)\|Go]], which implements various higher-order functions common in functional programming languages using [[Generic programming\|generics]]. In a benchmark provided by the library's author, calling <code>map</code> is 4% slower than an equivalent <code>for</code> loop and has the same [[Memory management\|allocation]] profile,<ref>{{Citation \|last=Berthe \|first=Samuel \|title=samber/lo \|date=2024-04-29 \|url=https://github.com/samber/lo \|access-date=2024-04-29}}</ref> which can be attributed to various compiler optimizations, such as [[inlining]].<ref>{{Cite web \|title=Go Wiki: Compiler And Runtime Optimizations - The Go Programming Language \|url=https://go.dev/wiki/CompilerOptimizations \|access-date=2024-04-29 \|website=go.dev \|language=en}}</ref> One distinguishing feature of [[Rust (programming language)\|Rust]] are ''zero-cost abstractions''. This means that using them imposes no additional runtime overhead. This is achieved thanks to the compiler using [[loop unrolling]], where each iteration of a loop, be it imperative or using iterators, is converted into a standalone [[Assembly language\|Assembly]] instruction, without the overhead of the loop controlling code. If an iterative operation writes to an array, the resulting array's elements [[Register allocation\|will be stored in specific CPU registers]], allowing for [[Time complexity\|constant-time access]] at runtime.<ref>{{Cite web \|title=Comparing Performance: Loops vs. Iterators - The Rust Programming Language \|url=https://doc.rust-lang.org/book/ch13-04-performance.html \|access-date=2024-04-29 \|website=doc.rust-lang.org}}</ref>

Functional programming: Difference between revisions